Back to overview

Is Threema open source?

Yes, to ensure full transparency, the Threema apps are open source.

Thanks to reproducible builds, there’s also a way to verify that the published code (of the Android app, for the time being) actually corresponds to the apps available for download in the app stores.

To learn how to download, build, and reproduce the Threema app’s code, please refer to the Open Source subsite.

Follow us

Threema

Made in Switzerland © 2025 Threema GmbH.